linux-kernel - [PATCH 0/7] can: m_can: fix pm_runtime and CAN state handling

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Message-Id: <20250812-m_can-fix-state-handling-v1-0-b739e06c0a3b@pengutronix.de>
Date: Tue, 12 Aug 2025 19:36:50 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Chandrasekar Ramakrishnan <rcsekar@...sung.com>, 
 Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
 Patrik Flykt <patrik.flykt@...ux.intel.com>, 
 Dong Aisheng <b29396@...escale.com>, Fengguang Wu <fengguang.wu@...el.com>, 
 Varka Bhadram <varkabhadram@...il.com>, Wu Bo <wubo.oduw@...il.com>, 
 Markus Schneider-Pargmann <msp@...libre.com>, 
 Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
 kernel@...gutronix.de, Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 0/7] can: m_can: fix pm_runtime and CAN state handling

The first patch fixes a pm_runtime imbalance in the m_can_platform
driver.

The rest of this series fixes the CAN state handling in the m_can
driver:
- add the missing state transition from from Error Warning back to
  Error Active (Patches 2+3)
- address the fact that in some SoCs (observed on the STM32MP15) the
  M_CAN IP core keeps the CAN state and CAN error counters over an
  internal reset cycle. Set the correct CAN state during ifup and
  system resume (Patches 4+5)
- add support for optional shared external reset, to properly reset
  the IP core (Patches 6+7)

Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
Marc Kleine-Budde (7):
      can: m_can: m_can_plat_remove(): add missing pm_runtime_disable()
      can: m_can: m_can_rx_handler(): only handle active interrupts
      can: m_can: m_can_handle_state_errors(): fix CAN state transition to Error Active
      can: m_can: m_can_chip_config(): bring up interface in correct state
      can: m_can: fix CAN state in system PM
      can: m_can: m_can_get_berr_counter(): don't wake up controller if interface is down
      can: m_can: add optional support for reset

 drivers/net/can/m_can/m_can.c          | 93 ++++++++++++++++++++++++----------
 drivers/net/can/m_can/m_can.h          |  1 +
 drivers/net/can/m_can/m_can_platform.c |  2 +-
 3 files changed, 68 insertions(+), 28 deletions(-)
---
base-commit: 89886abd073489e26614e4d80fb8eb70d3938a0b
change-id: 20250811-m_can-fix-state-handling-0ba4bda6cb8e

Best regards,
--  
Marc Kleine-Budde <mkl@...gutronix.de>